Stove



' D. B. CARD Sept. 26, 1939.

STOVE Filed Jan. 12, 1957 Fig.1.

Inv entor:

Dqn B.Card.

Afforney Patented Sept. 26, 1939 UNITED STATES STOVE D on B. Gard,

Portland, Greg.

Application January 12, 1937, Serial No. 120,269

7 Claims.

My invention relates to stoves of the general type wherein a damper isemployed todirect the flow of the products of combustion.

The principal object of my invention is the 5 provision of a stove ofhigh efficiency combined with ease and safety of operation.

Other objects and advantages of my invention will be apparent in thefollowing discourse wherein the significance of the reference numeralsin the accompanying drawing, details of construction and operation of astove embodying my in vention, and the particular advantages thereof areexplained.

Figure 1 represents a View of the entire stove with connected smoke-pipepartly in elevation and partly in section.

Figure 2 represents a view ofthe top of the stove.

Figure 3 represents a View of fragments of the damper-chamber andstove-door particularly illustrating the actuating mechanism of thedamper shown in the closed position.

Figure 4 represents a view of a fragment of the stove-door partly insection to reveal the draft control devices attached thereto.

The numeral I indicates a cylindrical steel shell supported upon legs as2 and 3 attached to the bottom 4 and formed in detail at the upper endthereof with horizontal and inclined sections to accommodate the top 5formed to effect a closure of the upper end.

A second cylindrical chamber 6 forms the firebox and is disposed inconcentric relationship within the shell I. It is so formed at its upperend as to provide a spaced relationship between the upper extremities ofthe fire-box 6 and the top 5 as shown at I.

The top 5 is formed with a damper-chamber 8 fashioned interiorly with adamper seat 9 and exteriorly to provide a place of attachment for thesmoke-pipe II.

A damper I is formed with lateral shaft portions I2 and I3 upon whichthe damper swings in suitable journals in the said damper-chamber 8 uponan horizontal axis. One of the said shaft portions I3 is extended andformed into a handle I4. Extending downwardly from the said horizontalaxis upon which the said damper I0 swings is 2, lug I formed upon theunder side of the damper II].

A door I6 is journaled in the top 5 at I! and I8 and is provided with ahandle I9 for raising to attend the fire. Depending from the under sideof the door I6 is a draft-pipe 20 pivotally attached at 2| andcommunicating at it upper end with a suitable aperture 22 in the doorI6. A screw-adjusted draft-control 23 is mounted to cover the aperture22.

Extending upwardly from the horizontal axis upon which the door swingsis a cam 24 formed integrally upon the door I6.

A second smoke outlet is provided at the bottom of the shell I by meansof a pipe connection 25 which provides unobstructed communicationbetween the lower part of the shell I and the smoke-pipe 26 to which theupper smoke-pipe It is also attached.

On starting a fire the kindling is laid in the usual manner in thefire-box 6, the damper I0 is opened by means of the handle I4 and thedraftcontrol 23 opened. As soon as the chimney draft is established thedamper I0 is lowered to its closed position as illustrated in Figure 3when the products of combustion are drawn downwardly around the fire-box6 to the lower part of the shell I from where they flow out through thelower smoke-pipe connection 25 and smoke-pipe 26, thus providing a highkindling temperature within the fire-box 6 and a relatively greatradiating surface afforded by the exterior surface of the shell Iextending nearly to the floor.

My invention contemplates this high operating efficiency combined withcertain novel advantages accruing out of the special arrangement andforms of the door I6, draft-pipe 20, damper I6, and inclined top 5coacting to provide new effects of great value.

When it is necessary to attend the fire, the door I6 is raised by meansof the handle I9 to the approximate position shown in Figure 1 orslightly higher when the fire box may be examined or fuel added. In thisupward movement of the door I6, the damper ID is automatically opened bythe operation of the cam 24 engaging the lug I5 as shown in Figure 3. Itis to be observed that the full opening of the damper I0 is attainedwith only a slight movement of the door I6 and the damper IE is held inthe open position as the door I6 is further raised to the limit of itsswing. This is accomplished by the arcuate form of the cam 24 in themanner well understood. This upward movement of the damper ID ofrelatively great celerity provides for the impulsion upwardy of thegases contained in the damper chamfer 8 and the consequent immediateestablishment of the flow of the products of combustion out through thesmoke-pipe 26 to the end that no smoke will be emitted from the dooropening. This eifect is further enhanced by the inclined position of thedoor 16 as illustrated in Figure 1 where the upward flow of gases fromthe fire-box will be diverted toward the damper-chamber 8.

At the same time the influx of fresh air normally flowing downwardlythrough the draftpipe 20 is broken by reason of the admission ofatmospheric pressure to the fire-box.

When the door is in the open position as shown in Figure 1 theconnection between the upper end of the draft-pipe 20 and the aperture22 in the door I6 is broken and a large proportion of the gasesnaturally tending to rise in the draft-pipe 20 at this juncture isdirected rearwardly toward to the normal smoke outlet. Indeed, byjudicious handling of the door, escape of smoke through the aperture 22may be entirely avoided.

Should it be necessary to gain greater access to the fire-box 6 as forputting in large pieces of fuel, or cleaning out of ashes, the door 16may be swung past the vertical where it will remain by force of gravity.When the door is thus opened to its fullest extent the draft-pipe 20will thus be removed from the center of the fire-box 6 toward the rearthereof and at the same time raised sufficiently to permit easy accessto the most remote portions.

Upon closing the door [6 the draft-control 23 is automaticallyreconnected in its operative position, the lower end of the draft-pipeis replaced over the center of the fire at the proper level, and thedamper I0 is automatically lowered to its closed position and the flowof gases once more directed to the lower smoke outlet as at firstdescribed.

Having described my invention what I claim is:

1. In a stove of the type described, a door and a damper pivotallymounted to swing in opposite directions upon parallel axes and formedrespectively with an arcuate cam extending upwardly from the axis ofsaid door mounting and a lug engaged by said cam extending downwardlyfrom the axis of said damper mounting to provide for the simultaneousand unequal movement of both said door and said damper when the formeris opened and for the independent manual operation of the latter.

2. In a stove having upper and lower smoke outlets, a damper to directthe products of combustion through one or the other of said smokeoutlets pivotally mounted and formed with a lug depending from the axisof said pivotal mounting. in combination with a door pivotally mountedin proximity to said damper and formed with a cam to engage said damperlug to lift said damper when the door is opened and to allow of thedisengagement of said lug and cam when the said damper is operatedmanually.

3. A stove comprising, a fire-box, a shell surrounding said fire-box inspaced relationship thereto, an upper smoke outlet communicating withboth said fire-box and said shell, 2. lower smoke outlet communicatingwith the lower por tion of said shell, a damper closed by gravitydisposed in said upper smoke outlet formed with a lug, and a dooraffording access to said fire-box formed with a cam to engage saiddamper lug to open said damper, wherein said cam and said lug are soformed and arranged to provide for the simultaneous lifting and openingof said damper and said door when the latter is opened.

4. A stove comprising, a fire-box, a shell surrounding said fire-box inspaced relationship thereto, a top affixed to said shell above the upperextremity of said fire-box, an upper smoke outlet communicating withboth said fire-box and said shell, a lower smoke outlet communicatingwith the lower portion of said shell, a damper disposed in said uppersmoke outlet formed with a lug, a door fitted to said top formed with acam to engage said damper lug, an aperture in said door fitted with adevice for closing the same, a draft-pipe pivotally suspended from theunder side of said door communicating with said aperture when said dooris closed to conduct fresh air to the fire and disconnected therefromwhen said door is opened, and suitable handles attached to said door andsaid damper for manual operation.

5. A stove comprising, a fire-box, a shell sur rounding said fire-box inspaced relationship ,5

thereto, a top affixed to said shell to provide in-- terccmmunicationbetween said fire-box and said shell, an upper smoke outlet formed insaid top and communicating with both said fire-box and said shell, alower smoke outlet communicating with the lower portion of said shell, apivotally mounted damper disposed in said upper smoke outlet and formedwith a lug, a door fitted to said top and pivotally attached thereto toswing upon an axis parallel with that of said pivotal damper-mountingformed with a cam to engage said damper lug, an aperture in said doc-rfitted with a closing device, and a draft-pipe pivotally suspended fromthe under side of said door communicating with said aperture when saiddoor is closed to conduct fresh air to the fire and disconnectedtherefrom when said door is opened, and suitable handles attached tosaid door and said damper for manual operation.

6. A stove comprising, a fire-box, a shell sur rounding said fire-box inspaced relations-mp thereto, and inclined top affixed to said shell toprovide intercommunication between said firebox and said shell, an uppersmoke outlet formed in said top communicating with both said firebox andsaid shell, a lower smoke outlet communicating with the lower portion ofsaid shell, a pivotally mounted damper disposed in said upper smokeoutlet and formed with a lug, a door fitted to said top and pivotallyattached thereto to swing upon an axis parallel with that of saidpivotal damper-mounting formed with a cam to engage said damper-lug, anaperture in said door fitted with a closing device, and a draft-pipepivotally suspended from the under side of said door communicating withsaid aperture when said door is closed to conduct fresh air to the fireand disconnected therefrom when said door is opened.

7. In a stove of the kind described, the combination of an inclined topfitted with pivoted door, a pivotally suspended draft-pipe communieatingwith an aperture in said door, and damper actuated by a cam moving withsaid door, the parts being arranged to provide for the opening of saiddamper and the deflection of said draft-pipe when said said door isopened.

DON B. CARD,

